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Retirement Benefits (Details 4) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Pension Benefits [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year $ 2,829.8 $ 2,727.7  
Service cost 16.4 14.1 $ 20.6
Interest cost 104.8 116.7 125.4
Benefits paid (294.5) (220.1)  
Subsidy paid 0.0 0.0  
Effect of currency rates (4.5) 7.4  
Net actuarial (gains) losses - discount rate change (150.4) 174.6  
Net actuarial (gains) losses - other (5.7) 9.4  
Plan curtailments 0.4 0.0  
Plan amendments 1.4 0.0  
Benefit obligation at end of year 2,497.7 2,829.8 2,727.7
Other Postretirement Benefits [Member]      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year 349.9 354.8  
Service cost 2.5 2.4 2.6
Interest cost 12.7 14.6 16.0
Benefits paid (36.5) (38.6)  
Subsidy paid 0.0 0.6  
Effect of currency rates 0.0 0.0  
Net actuarial (gains) losses - discount rate change (17.8) 16.6  
Net actuarial (gains) losses - other 48.3 (0.5)  
Plan curtailments 0.0 0.0  
Plan amendments 0.0 0.0  
Benefit obligation at end of year $ 359.1 $ 349.9 $ 354.8